digitalmars.D - std.string.removechars does not remove leading chars

This is supposed to be a bug report! :)
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import std.string;
int main( char[][] args )
{
// Construct a string with some whitespaces.
string stripMyWhitespaces = "\t\t\tHello _World !\t\t\t";
// Strip the whitespaces using "removechars". This worked in GDC/D1.0 without
problems.
string helloWorld = removechars( stripMyWhitespaces, whitespace );
// Ensure '\t' is in "whitespace".
assert( find( whitespace, "\t" ) != -1 );
// "helloWorld" equals "\t\t\tHello_World!", not "Hello_World!", assert fails.
Leading '\t's are not removed.
assert( helloWorld == "Hello_World!" );
return 0;
}
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In the above example, the second assert fails; not just with '\t', but also
with any other char literal. This behaviour is not documented, so it's probably
a bug indeed.
I came across this bug while porting from GDC to D2.012. Looking at the phobos
sources of both compilers, it seems like the implementation of "removechars"
changed (don't ask me why!).
Andreas Jung